They are both technically right, but the majority of people would say 'an' STD. When talking about something that begins with a vowel-sounding letter, we tend to use 'an' - it just sounds better to...
Here's a site with more info on STDs... http://linkisking.com/jk.cgi?i=D8dRZeY&d=www.epigee.org%2Fguide%2Fstds.html%20&n=15 copy and paste the link No they have to have the STD in order to...
The only way to really tell if you indeed have an STD would be through a blood or urine analysis. You can either go get tested with your doctor or if you want confidential, same-day testing you can...
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